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Answer:
To round the number 1.808943 to 3 significant figures, you need to consider the first three digits after the decimal point.
Here's the process:
1. Look at the number: 1.808943.
2. Identify the first three significant figures: 1.80.
3. Look at the digit immediately after these three significant figures to determine if rounding is needed. The digit after 1.80 is 8.
4. Since 8 is greater than 5, round up the last significant figure.
So, 1.808943 rounded to 3 significant figures is 1.81.